The turret can be adapted to many basic tank chassis to create a self-propelled anti-aircraft gun. The only known major operator of the system to date is the Finnish Army, which ordered 7 units in 1990. The turrets were fitted on Polish T-55AM tank chassis. The system is known as the ItPsv 90 in Finnish service (Ilmatorjuntapanssarivaunu 90, Anti-Aircraft tank 90, the number being the year the tank entered service). It is considered a very accurate anti-aircraft artillery system, having a documented hit percentage of 52.44%.[2]

In 2010, the Marksman systems in service in Finland were moved to war-time storage.[3] In 2015 work began to install the system on the Leopard 2A4 chassis in order to make up for the loss of mobile anti-aircraft coverage when the Marksman was originally retired.[4] The new Leopard 2 Marksman was scheduled to enter service in 2016.[5]

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Finland has seven ItPsv 90 Marksman anti-aircraft systems, providing low-level air-defense for tank battalions. The SPAAGs are organically tied to the headquarters company and form teams of two. The vehicles have an all-day capacity, and there is also a back-up crew to ensure combat survivability. The ItPsv 90 Marksman is primarily meant to fight helicopters, low-flying aircraft and unmanned aerial vehicles (UAVs). It is also possible to engage surface and armored targets.

The chassis of the ItPsv 90 Marksman is a Polish T-55AM tank, which has been modified to fit the turret. The AM version was chosen due to the increased weight of the system (a T-55AM weighs 36 tons, while a T-55AM Marksman weighs 41 tons) and the AM has more power (620 hp) than a regular T-55. The weapon system is guided by a British Marconi 400 series frequency agile surveillance and tracking X/J-band radar, which is able to detect targets out to 12 km in search mode and 10 km in tracking mode. The laser distance measure device functions up to 8 km. The commander and the gun operator both have gyro-stabilized optical aiming devices.

The armament consists of two Swiss 35 mm Oerlikon anti-aircraft guns, with a rate of fire of 18 rounds per second. The fragmentation round has a muzzle velocity of 1,175 m/s. The effective range is 4,000 meters. The vehicle is also equipped with eight Wegmann 76 mm smoke dischargers, a 7.62 mm assault rifle, and a flare gun. The turret can traverse a full 360 degrees and has an elevation range of −10 to +85 degrees. The magazines hold 460 fragmentation rounds and 40 anti-tank rounds.

The new Leopard 2 chassis greatly improves mobility compared to the older T-55AM chassis, both on- and off-road. The Leopard 2 chassis is also larger, thus providing a more stable firing platform for the Marksman turret to operate from.[6]

There are three communication radios in the vehicle for fire guidance and communications. The vehicle is operated by three crew members: commander, gunner, and driver.